#bronchus__bronchial_tube__bronchialtube  either of the two main branches of the trachea
  supertype:  cartilaginous_tube__cartilaginoustube  a tube with cartilaginous walls
  part of:  lower_respiratory_tract
  subtype:  bronchiole  any of the smallest bronchial tubes; ending in alveoli

No statement uses or specializes bronchus; click here to add one.